Slow is only Gunner, and Gunners cover that crap up with Leg It! and Hero Shield. With the PTE testing out the new additions to Gunner skills, Gunners are probably the most broken douchebags in Battlefield Heroes.
Tanks are easy to control.
I mainly play on my National Commando, Chinitsu, or my Royal Soldiers, Daisuushii, 13 and 9 respectively. Won't be playing as much with DFO opened though.